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DTSTAMP:20260424T114118Z
UID:1690380900@ist.ac.at
DTSTART:20230726T161500
DTEND:20230726T171500
DESCRIPTION:Speaker: Jonas Lampart\nhosted by Robert Seiringer / David Mitr
 ouskas\nAbstract: I will discuss spectral properties of a Bose gas with an
  impurity in the dilute (Gross-Pitaevskii) limit.In this limit\, the Bose 
 gas is known to form a Bose-Einstein condensate\, with excitations out of 
 the condensate described by Bogoliubov theory. The strength of the interac
 tion with the impurity is chosen so that the interaction with these excita
 tions is of the same order as the energy of the excitations themselves. I
  will show that\, after removal of contributions to the ground state energ
 y that diverge with the number of bosons\, the renormalised Bogoliubov-Fr
 öhlich Hamiltonian emerges as the effective operator describing the excit
 ation spectrum. This is joint work with Arnaud Triay.
LOCATION:Big Seminarroom B\, Sunstone Building\, ISTA\, ISTA
ORGANIZER:birgit.oosthuizen-noczil@ist.ac.at 
SUMMARY:Jonas Lampart: Excitation spectrum of a dilute Bose gas with an imp
 urity
URL:https://talks-calendar.ista.ac.at/events/4337
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